Abida occidentalis
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Abida occidentalis |
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| Abida occidentalis | ||||||||||||
| ( Fagot , 1888) |
Abida occidentalis (dt .: Western Rogge grain auger) is a kind of chondrinidae (Chondrinidae) from the subordination of terrestrial snails (gastropod).
features
The slim to very slim spindle-shaped housing is 6 to 8 mm high and 2.1 to 2.3 mm wide. The 8 to 9¾ turns are moderately to strongly curved. They gain weight quickly at first, later more slowly; the last turn is often even a little narrower than the penultimate turn. The casing is colored brown and the surface has fairly regular, fine ribbing. The mouth is rounded and has a comparatively small diameter. On the inside of the mouth rim there is a strong, massively thickened white lip. At the parietal edge, the mouth edge is closed and pulled forward about 0.4 mm. The mouth reinforcement consists of a strong parietalis and an angularis, which can sometimes be fused with a spiral fold (spiral); a subangular fold is not developed. The spindle lamella (Columellaris) is more powerful than the lower spindle lamella (Infracolumellaris). The upper palatal fold (palatalis superior), the lower palatal fold (palatalis inferior) and the infrapalatalis are not or only slightly developed as double cusps and reach the edge of the mouth in front. They usually do not reach very deep into the mouth; the rear end can usually still be seen from the outside. Occasionally a suprapalatalis is developed. Often there is also a weak bulge on the neck. The navel can also be partially seen relatively wide and vertically from below. The last turn narrows somewhat and is flattened crookedly. The base of the last turn is somewhat keeled. In the area of the infrapalatalis, the last turn is slightly indented and a short longitudinal furrow has formed.
In the male part of the genital apparatus, the penis and epiphallus form a loop. Both are about the same length and also about the same thickness. The vas deferens or the epiphallus are integrated basal in the tissue of the penis; this causes the closed loop of the penis and epiphallus. The penile retractor inserts on the first quarter of the loop; H. on the lower quarter of the penis and on the upper quarter of the epiphallus. The spermatic duct lies close to the free fallopian tube and the vagina. The vagina is slightly shorter than the penis and epiphallus, but slightly longer than the free fallopian tube (oviduct). The stalk of the seminal vesicle (spermathec) is about twice as wide as the fallopian tube at the branching free oviduct / stalk. The diameter initially decreases towards the only slightly wider bladder. The stalk is not embedded in the tissue of the prostate gland; the bladder lies at the level of the egg duct and prostate gland. The radula shows 15 to 16 posterior teeth in a semi-transverse row next to the central tooth.
Similar species
Abida occidentalis can not be confused with any other Abida species due to the rounded mouth with the contiguous, somewhat protruding mouth edges at the parietal edge and the palatal lamellae that extend far forward but are not formed as double humps, the ends of which are visible from the outside .
Geographical distribution and habitat
The species is mainly restricted to the northern part of the Pyrenees, although it has not been found alive since 1980. To date, only one occurrence has been reported south of the main ridge of the Pyrenees in the province of Lleida ( Catalonia ). It lives on chalky rocks and limestone rubble between about 350 m and 1400 m above sea level.
Taxonomy
The taxon was first described in 1888 by Paul Fagot as Pupa occidentalis . Henry Augustus Pilsbry assigned them to the genus Abida . No synonyms are known.
Danger
According to the assessment of the International Union for Conservation of Nature and Natural Resources (IUCN), the species is not endangered.
supporting documents
literature
- Edmund Gittenberger: Contributions to the knowledge of the pupillacea: III. Chondrininae. Zoologische Verhandelingen, 127 (1): 3-267, 1973 ISSN 0024-1652 PDF .
- Michael P. Kerney, RAD Cameron & Jürgen H. Jungbluth: The land snails of Northern and Central Europe. 384 pp., Paul Parey, Hamburg & Berlin 1983 ISBN 3-490-17918-8 (p. 110)
- Francisco W. Welter-Schultes: European non-marine molluscs, a guide for species identification = identification book for European land and freshwater mollusks. A1-A3 S., 679 S., Q1-Q78 S., Göttingen, Planet Poster Ed., 2012 ISBN 3-933922-75-5 , ISBN 978-3-933922-75-5
- Carl Agardh Westerlund: Spicilegium malacologicum. New inland conchylia in the Palearctic region. Negotiations of the Imperial-Royal Zoological-Botanical Society in Vienna, 42 (Treatises): 25–48, Vienna 1892. Online at www.biodiversitylibrary.org (p. 37)
Individual evidence
- ↑ Miquel Bech: presencia a Catalunya d'Abida occidentalis (Fagot, 1888) (Mollusca, Pulmonata, Chondrininae). Miscellània Zoològica, 6: 151-152, 1980 PDF
- ^ Paul Fagot: Contribuciones á la fauna malacológica de Aragón. Catálogo razonado de los moluscos del Valle del Éssera. Crónica Científica, 10, 11: (10) 345-347, 481-484, (11) 31-39, 103-108, 127-131, 193-198, Barcelona 1887-1888 (p. 195; not seen).
- ^ Henry Augustus Pilsbry: Manual of Conchology. Second Series: Pulmonata, 24. Pupillidae (Gastrocoptinae). SI-XII, pp. 1-380, Philadelphia, 1916-1918. Online at www.archive.org
- ↑ Fauna Europaea: Abida occidentalis (Fagot 1888)
- ↑ Gargominy, O. 2011. Abida occidentalis . In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. <www.iucnredlist.org>. Retrieved September 23, 2013.